On Nov 21, 2011, at 8:01 AM, Jed Brown wrote: > On Mon, Nov 21, 2011 at 04:52, Hui Zhang <buyong.huier at gmail.com> wrote: > When using DMDAGlobaltoLocal, how can I communicate only the boundary of the > ghosted domain (with stecil width larger than one)? > > Only the ghost values are communicated. The interior is all local.
I think Hui means DMDALocalToLocalBegin() and DMDALocalToLocalEnd() but normally one doesn't need this with the PETSc solvers, one only needs the DMGlobalToLocalBegin/End() Barry
